Stefano Bagnara wrote:
> Answering "550 We don't accept spam" to the "CRLF.CRLF" (end of DATA) will
> be better than 1) because we don't need to send a further mail and better
> that 2) because the sender will know the message won't be handled.
> We should be aware that RFC states that an SMTP server SHOULD NOT takes
too
> long before replying to the CRLF.CRLF to avoid message duplicate message
> transmissions.
Right. This is why I keep presenting solutions that allow the choice of
either in-protocol or in-pipeline. In fact, some solutions might favor
doing a simple check in-protocol, and then a more robust check for messages
that make it into pipeline. But either my or Danny's fast-fail proposal
should allow this to be administratively configured.
--- Noel
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